Black beans in the beans is a very high nutritional value of a kind, black beans eat a lot of ways, vinegar soaked black beans have the effect of treating gray hair. Take 200g of vinegar, 50g of small black beans, clean the selected beans first, put them in a pot and fry them, not for too long, mainly until the skin of the beans breaks, but make sure they are not mushy. After cooling, put the black beans into a clean bottle and add vinegar. Be sure to add a little more, because of the black beans will absorb a lot of vinegar, rest after two hours is complete. Then, use a few every morning and evening, you can eat as a snack, you can not eat too much at a time, easy to bloat. At least a few months to eat, because a short period of time is not going to work.